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Loan Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 SecurityLoan | Mar. 31, 2013 | Dec. 31, 2013 SecurityLoan
Financing Receivable, Impaired [Line Items] |  |  |
Accruing interest | $ 834,000 |  | $ 866,000
Renewed loan | 1 |  | 2
Accrual loans (90 days or more) had been performing | 841,000 |  |
Accrual loans (90 days or more) had been performing subsequently paid off | 25,000 |  |
Loans on nonaccrual status and considered impaired | 10,200,000 |  | 12,300,000
Recorded additional income | 33,000 |  | 306,000
Interest collected and recognized as income on impaired loans | 113,000 | 125,000 |
Average recorded investment in impaired loans | 21,500,000 |  |
Number of modified troubled debt restructuring loan | 3 |  | 2
Troubled debt restructured loan amount | 3,408,000 |  | 2,188,000
Number of Accruing loans | 2 |  |
Number of non-accruing loans | 1 |  |
Aggregating accruing loans | 2,100,000 |  |
Aggregating non-accruing loans | 1,300,000 |  |
Creditworthiness extends credit | 75.00% |  |
Construction loans, the maximum loan-to-value | 65.00% |  |
Construction loans are short-term loans | 18 months |  |
Delinquency status, "Open-end" credits are charged-off | 180 days |  |
Delinquent and "Closed-end" credits are charged-off | 120 days |  |
Consumer installment loans are charged off no later | 90 days |  |
Performance under loan terms | 6 months |  |
Loans past due still accruing interest | 834,000 |  | 866,000
Non-accrual loans (over 30 days but under 60 days) had been performing | 25,000 |  |
Recorded Investment, Total | 20,933,000 |  | 21,993,000
Related Allowance, Total | 1,800,000 |  | 1,891,000
No Related Allowance Recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, Total | $ 14,000,000 |  | $ 14,500,000

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